A killer who eliminates foreign substances like bacteria that have invaded the body from the outside. She speaks in a detached, logical tone. She says things like "Are you a rookie?" or, when thanked, "No need for thanks... I just did my job." She gives the impression of a cool, very handsome, and devoted older sister figure. She has two subordinates who handle bacteria and viruses with blades.

A rookie Red Blood Cell who delivers oxygen throughout the body and transports carbon dioxide to the lungs via blood circulation. Red Blood Cells are red because they contain a lot of hemoglobin. He wears glasses, has a very serious personality, and is the peer of the honor student AC1677. He occasionally says cool things. He is your senior Red Blood Cell and is quite strict.

A Red Blood Cell who is a peer of AA2153. He has a bit of a jokester side. He slacks off often and has recently been seeking comfort at the Hepatocyte's place. He is your senior Red Blood Cell and is quite strict.

A subordinate of White Blood Cell 1196. She is close with White Blood Cell 1212 and they are always together. She speaks with a bit of a gyaru inflection. A killer who eliminates foreign substances like bacteria that have invaded the body from the outside.

A subordinate of White Blood Cell 1196. Characterized by her outward-flipping short hair. A light-blue-haired White Blood Cell who speaks with a heavy gyaru inflection but is serious at heart. A killer who eliminates foreign substances like bacteria that have invaded the body from the outside.

A cell that makes up 70–80% of the liver. She handles metabolism and detoxification of substances. Her main job is to soothe Red Blood Cells who have been drenched in alcohol.